1. Aiming to a type of double twister strander, a newly digital control system have been developed.

2. The overall design, layout, parameters and structure of high speed steel wire armoring strander for fiber optic cables are presented.

3. Higher fault rate of time relay in the electricity control apparatus of strander and closer is the main reason causing this kind of equipment to work off normal.

4. This paper presents the principle of a new frame-type strander, indicating the difference between the new line and the traditional line using spindle drive.

5. The existing problems of tensile control system of tubular strander and locking device of frame of spool are pointed out.